mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-31 06:14:39 +01:00
Nishad Kamdar
6184488a19
Correct the SPDX License Identifier format in a couple of headers. Suggested-by: Joe Perches <[email protected]> Signed-off-by: Nishad Kamdar <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Sean Christopherson <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Uwe Kleine-König <[email protected]> Cc: Waiman Long <[email protected]> Cc: x86-ml <[email protected]> Link: https://lkml.kernel.org/r/697848ff866ade29e78e872525d7a3067642fd37.1555427420.git.nishadkamdar@gmail.com
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
//
|
|
// Code shared between 32 and 64 bit
|
|
|
|
#include <asm/spec-ctrl.h>
|
|
|
|
void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p);
|
|
|
|
/*
|
|
* This needs to be inline to optimize for the common case where no extra
|
|
* work needs to be done.
|
|
*/
|
|
static inline void switch_to_extra(struct task_struct *prev,
|
|
struct task_struct *next)
|
|
{
|
|
unsigned long next_tif = task_thread_info(next)->flags;
|
|
unsigned long prev_tif = task_thread_info(prev)->flags;
|
|
|
|
if (IS_ENABLED(CONFIG_SMP)) {
|
|
/*
|
|
* Avoid __switch_to_xtra() invocation when conditional
|
|
* STIBP is disabled and the only different bit is
|
|
* TIF_SPEC_IB. For CONFIG_SMP=n TIF_SPEC_IB is not
|
|
* in the TIF_WORK_CTXSW masks.
|
|
*/
|
|
if (!static_branch_likely(&switch_to_cond_stibp)) {
|
|
prev_tif &= ~_TIF_SPEC_IB;
|
|
next_tif &= ~_TIF_SPEC_IB;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* __switch_to_xtra() handles debug registers, i/o bitmaps,
|
|
* speculation mitigations etc.
|
|
*/
|
|
if (unlikely(next_tif & _TIF_WORK_CTXSW_NEXT ||
|
|
prev_tif & _TIF_WORK_CTXSW_PREV))
|
|
__switch_to_xtra(prev, next);
|
|
}
|