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| author | Peter Zijlstra <peterz@infradead.org> | 2020-05-29 23:27:38 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:15:23 +0200 |
| commit | fd501d4f0399700011acde486576c7c1eb8e7a61 (patch) | |
| tree | 8c5c09d3cb0b5aa0f249c6627dc4298354f21442 /arch/x86/kernel/asm-offsets_64.c | |
| parent | f9912ada82862df341b3e86864cbd532d0d24b84 (diff) | |
| download | linux-fd501d4f0399700011acde486576c7c1eb8e7a61.tar.gz linux-fd501d4f0399700011acde486576c7c1eb8e7a61.tar.bz2 linux-fd501d4f0399700011acde486576c7c1eb8e7a61.zip | |
x86/entry: Remove DBn stacks
Both #DB itself, as all other IST users (NMI, #MC) now clear DR7 on
entry. Combined with not allowing breakpoints on entry/noinstr/NOKPROBE
text and no single step (EFLAGS.TF) inside the #DB handler should guarantee
no nested #DB.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200529213321.303027161@infradead.org
Diffstat (limited to 'arch/x86/kernel/asm-offsets_64.c')
| -rw-r--r-- | arch/x86/kernel/asm-offsets_64.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c index c2a47016f243..828be792231e 100644 --- a/arch/x86/kernel/asm-offsets_64.c +++ b/arch/x86/kernel/asm-offsets_64.c @@ -57,9 +57,6 @@ int main(void) BLANK(); #undef ENTRY - OFFSET(TSS_ist, tss_struct, x86_tss.ist); - DEFINE(DB_STACK_OFFSET, offsetof(struct cea_exception_stacks, DB_stack) - - offsetof(struct cea_exception_stacks, DB1_stack)); BLANK(); #ifdef CONFIG_STACKPROTECTOR |