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x86/speculation/mds: Mark mds_user_clear_cpu_buffers() __always_inline

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Prevent the compiler from uninlining and creating traceable/probable
functions as this is invoked _after_ context tracking switched to
CONTEXT_USER and rcu idle.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134340.902709267@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-03-04 12:49:18 +01:00
parent 4983e5d74c
commit a7ef9ba986
1 changed files with 2 additions and 2 deletions
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4
arch/x86/include/asm/nospec-branch.h
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@ -262,7 +262,7 @@ DECLARE_STATIC_KEY_FALSE(mds_idle_clear);
* combination with microcode which triggers a CPU buffer flush when the
* instruction is executed.
*/
static inline void mds_clear_cpu_buffers(void)
static __always_inline void mds_clear_cpu_buffers(void)
{
static const u16 ds = __KERNEL_DS;
@ -283,7 +283,7 @@ static inline void mds_clear_cpu_buffers(void)
*
* Clear CPU buffers if the corresponding static key is enabled
*/
static inline void mds_user_clear_cpu_buffers(void)
static __always_inline void mds_user_clear_cpu_buffers(void)
{
if (static_branch_likely(&mds_user_clear))
mds_clear_cpu_buffers();