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author | Andy Lutomirski <luto@amacapital.net> | 2014-11-22 18:00:32 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-11-23 13:56:19 -0800 |
commit | 6f442be2fb22be02cafa606f1769fa1e6f894441 (patch) | |
tree | 1173ca6feb0cdda19b5383e713e2f19152d88940 /arch/x86/include/asm/page_32_types.h | |
parent | af726f21ed8af2cdaa4e93098dc211521218ae65 (diff) | |
download | blackbird-obmc-linux-6f442be2fb22be02cafa606f1769fa1e6f894441.tar.gz blackbird-obmc-linux-6f442be2fb22be02cafa606f1769fa1e6f894441.zip |
x86_64, traps: Stop using IST for #SS
On a 32-bit kernel, this has no effect, since there are no IST stacks.
On a 64-bit kernel, #SS can only happen in user code, on a failed iret
to user space, a canonical violation on access via RSP or RBP, or a
genuine stack segment violation in 32-bit kernel code. The first two
cases don't need IST, and the latter two cases are unlikely fatal bugs,
and promoting them to double faults would be fine.
This fixes a bug in which the espfix64 code mishandles a stack segment
violation.
This saves 4k of memory per CPU and a tiny bit of code.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/include/asm/page_32_types.h')
-rw-r--r-- | arch/x86/include/asm/page_32_types.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/include/asm/page_32_types.h b/arch/x86/include/asm/page_32_types.h index f48b17df4224..3a52ee0e726d 100644 --- a/arch/x86/include/asm/page_32_types.h +++ b/arch/x86/include/asm/page_32_types.h @@ -20,7 +20,6 @@ #define THREAD_SIZE_ORDER 1 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) -#define STACKFAULT_STACK 0 #define DOUBLEFAULT_STACK 1 #define NMI_STACK 0 #define DEBUG_STACK 0 |