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| author | Mark Rutland <mark.rutland@arm.com> | 2020-12-17 00:32:48 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-17 01:08:47 +0300 |
| commit | 870d16757ba8918c3f8cac162b9ca7669556dbab (patch) | |
| tree | c047c19cbfeed18571b3d63c20466903e10e3bda /arch/arm64 | |
| parent | 19778dd504b5ff5c3c1283aa3da7a56f34c2c3b0 (diff) | |
| download | linux-870d16757ba8918c3f8cac162b9ca7669556dbab.tar.xz | |
arm64: make _TIF_WORK_MASK bits contiguous
We need the bits of _TIF_WORK_MASK to be contiguous in order to to use
this as an immediate argument to an AND instruction in entry.S.
We happened to change these bits in commits:
b5a5a01d8e9a ("arm64: uaccess: remove addr_limit_user_check()")
192caabd4dd9 ("arm64: add support for TIF_NOTIFY_SIGNAL")
which each worked in isolation, but the merge resolution in commit:
005b2a9dc819 ("Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block")
happened to make the bits non-contiguous.
Fix this by moving TIF_NOTIFY_SIGNAL to be bit 6, which is contiguous
with the rest of _TIF_WORK_MASK.
Otherwise, we'll get a build-time failure as below:
arch/arm64/kernel/entry.S: Assembler messages:
arch/arm64/kernel/entry.S:733: Error: immediate out of range at operand 3 -- `and x2,x19,#((1<<1)|(1<<0)|(1<<2)|(1<<3)|(1<<4)|(1<<5)|(1<<7))'
scripts/Makefile.build:360: recipe for target 'arch/arm64/kernel/entry.o' failed
Fixes: 005b2a9dc819a126 ("Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/thread_info.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index b24056a0b02b..9f4e3b266f21 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -64,7 +64,7 @@ void arch_release_task_struct(struct task_struct *tsk); #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */ #define TIF_MTE_ASYNC_FAULT 5 /* MTE Asynchronous Tag Check Fault */ -#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ +#define TIF_NOTIFY_SIGNAL 6 /* signal notifications exist */ #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing */ #define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */ |