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authorAndy Lutomirski <luto@kernel.org>2015-06-09 22:36:01 +0300
committerIngo Molnar <mingo@kernel.org>2015-06-10 09:47:57 +0300
commit539f5113650068ba221197f190267ab727296ef5 (patch)
treeeafc4ade012f4ced276f92e891c9196af70f3f67 /arch/x86/include/asm/uaccess_32.h
parenta92fde25231a89d7d10895482556260c1b63767d (diff)
downloadlinux-539f5113650068ba221197f190267ab727296ef5.tar.xz
x86/asm/entry/64: Disentangle error_entry/exit gsbase/ebx/usermode code
The error_entry/error_exit code to handle gsbase and whether we return to user mdoe was a mess: - error_sti was misnamed. In particular, it did not enable interrupts. - Error handling for gs_change was hopelessly tangled the normal usermode path. Separate it out. This saves a branch in normal entries from kernel mode. - The comments were bad. Fix it up. As a nice side effect, there's now a code path that happens on error entries from user mode. We'll use it soon. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/f1be898ab93360169fb845ab85185948832209ee.1433878454.git.luto@kernel.org [ Prettified it, clarified comments some more. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/uaccess_32.h')
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