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2017-06-09kbuild: speed up checksyscalls.shArnd Bergmann1-7/+4
checksyscalls.sh is run at every "make" run while building the kernel, even if no files have changed. I looked at where we spend time in a trivial empty rebuild and found checksyscalls.sh to be a source of noticeable overhead, as it spawns a lot of child processes just to call 'cat' copying from stdin to stdout, once for each of the over 400 x86 syscalls. Using a shell-builtin (echo) instead of the external command gives us a 13x speedup: Before After real 0m1.018s real 0m0.077s user 0m0.068s user 0m0.048s sys 0m0.156s sys 0m0.024s The time it took to rebuild a single file on my machine dropped from 5.5 seconds to 4.5 seconds. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-03-24x86/syscalls/32: Ignore arch_prctl for other architecturesArnd Bergmann1-0/+1
sys_arch_prctl is only provided on x86, and there is no reason to add it elsewhere. However, including it on the 32-bit syscall table caused a warning for most configurations on non-x86: :1328:2: warning: #warning syscall arch_prctl not implemented [-Wcpp] This adds an exception to the syscall table checking script. Fixes: 79170fda313e ("x86/syscalls/32: Wire up arch_prctl on x86-32") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Kyle Huey <khuey@kylehuey.com> Link: http://lkml.kernel.org/r/20170323151904.706286-1-arnd@arndb.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-06-04x86/asm/entry: Move the arch/x86/syscalls/ definitions to ↵Ingo Molnar1-1/+1
arch/x86/entry/syscalls/ The build time generated syscall definitions are entry code related, move them into the arch/x86/entry/ directory. Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-05-20scripts/checksyscalls.sh: Make renameat optionalJames Hogan1-1/+4
The new renameat2 syscall provides all the functionality of renameat with an additional flags argument, so make renameat optional so that future architectures can omit it without getting a warning. This patch doesn't affect existing architectures. Signed-off-by: James Hogan <james.hogan@imgtec.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: linux-arch@vger.kernel.org
2012-09-25checksyscalls: fix "here document" handlingHeiko Carstens1-1/+1
"echo" doesn't read from stdin, therefore the checksyscalls script didn't warn about not implemented system calls anymore since 29dc54c6 ("checksyscalls: Use arch/x86/syscalls/syscall_32.tbl as source"). Use "cat" instead of "echo" which handles this correctly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Michal Marek <mmarek@suse.cz> Cc: H. Peter Anvin <hpa@linux.intel.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-11-18checksyscalls: Use arch/x86/syscalls/syscall_32.tbl as sourceH. Peter Anvin1-5/+10
Use the new arch/x86/syscalls/syscall_32.tbl file as source instead of arch/x86/include/asm/unistd_32.h. Cc: Michal Marek <mmarek@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2010-12-20checksyscalls: Fix stand-alone usageGeert Uytterhoeven1-2/+2
The usage help in the comments - refers to the wrong script name, - doesn't mention that $srctree must be set. Hence correct the script name, and derive the source tree path from the script path, so we no longer need to rely on $srctree being set by the caller. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-06-25Add wait4() back to the set of <asm-generic/unistd.h> syscalls.Chris Metcalf1-1/+0
The initial pass at the generic ABI assumed that wait4() could be easily expressed using waitid(). Although it's true that wait4() can be built on waitid(), it's awkward enough that it makes more sense to continue to include wait4 in the generic syscall ABI. Since there is already a deprecated wait4 in the ABI, this change converts that wait4 into old_wait, and puts wait4 in the next available slot for new supported syscalls, after the platform-specific syscalls at number 260. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2009-06-11asm-generic: add a generic unistd.hArnd Bergmann1-3/+89
A new architecture should only define a minimal set of system calls while still providing the full functionality. This version of unistd.h has gone through intensive review to make sure that by default it only enables syscalls that do not already have a more featureful replacement. It is modeled after the x86-64 version of unistd.h, which unifies the syscall number definition and the actual system call table in a single file, in order to keep them synchronized much more easily. This first version still keeps legacy system call definitions around, guarded by various #ifdefs, and with numbers larger than 1024. The idea behind this is to make it easier for new architectures to transition from a full list to the reduced set. In particular, the new microblaze architecture that should migrate to using the generic ABI headers can at least use an existing uClibc source tree without major rewrites during the conversion. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-10-30scripts/checksyscalls.sh: fix for non-gnu sedThomas Volpini1-2/+2
Make the checksyscalls script work even on systems where sed is non-gnu. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-10-23x86, um: ... and asm-x86 moveAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2007-10-11i386/x86_64: move headers to include/asm-x86Thomas Gleixner1-1/+1
Move the headers to include/asm-x86 and fixup the header install make rules Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-06-28Introduce fixed sys_sync_file_range2() syscall, implement on PowerPC and ARMDavid Woodhouse1-0/+5
Not all the world is an i386. Many architectures need 64-bit arguments to be aligned in suitable pairs of registers, and the original sys_sync_file_range(int, loff_t, loff_t, int) was therefore wasting an argument register for padding after the first integer. Since we don't normally have more than 6 arguments for system calls, that left no room for the final argument on some architectures. Fix this by introducing sys_sync_file_range2(int, int, loff_t, loff_t) which all fits nicely. In fact, ARM already had that, but called it sys_arm_sync_file_range. Move it to fs/sync.c and rename it, then implement the needed compatibility routine. And stop the missing syscall check from bitching about the absence of sys_sync_file_range() if we've implemented sys_sync_file_range2() instead. Tested on PPC32 and with 32-bit and 64-bit userspace on PPC64. Signed-off-by: David Woodhouse <dwmw2@infradead.org> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-02kbuild: complain about missing system callsSam Ravnborg1-0/+118
Most system calls seems to get added to i386 first. This patch automatically generates a warning for any new system call which is implemented on i386 but not the architecture currently being compiled. On PowerPC at the moment, for example, it results in these warnings: init/missing_syscalls.h:935:3: warning: #warning syscall sync_file_range not implemented init/missing_syscalls.h:947:3: warning: #warning syscall getcpu not implemented init/missing_syscalls.h:950:3: warning: #warning syscall epoll_pwait not implemented The file scripts/checksyscalls.sh list a number of legacy system calls that are ignored because they only makes sense on i386 systems. Other contributors to this patch are Russell King <rmk+lkml@arm.linux.org.uk> and Stéphane Jourdois <kwisatz@rubis.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>