Commit 5c8b0cbd authored by Will Deacon's avatar Will Deacon

arm64: Pull in task_stack_page() to Spectre-v4 mitigation code

The kbuild robot reports that we're relying on an implicit inclusion to
get a definition of task_stack_page() in the Spectre-v4 mitigation code,
which is not always in place for some configurations:

  | arch/arm64/kernel/proton-pack.c:329:2: error: implicit declaration of function 'task_stack_page' [-Werror,-Wimplicit-function-declaration]
  |         task_pt_regs(task)->pstate |= val;
  |         ^
  | arch/arm64/include/asm/processor.h:268:36: note: expanded from macro 'task_pt_regs'
  |         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  |                                           ^
  | arch/arm64/kernel/proton-pack.c:329:2: note: did you mean 'task_spread_page'?

Add the missing include to fix the build error.

Fixes: a44acf477220 ("arm64: Move SSBD prctl() handler alongside other spectre mitigation code")
Reported-by: default avatarAnthony Steinhauser <asteinhauser@google.com>
Reported-by: default avatarkernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202009260013.Ul7AD29w%lkp@intel.comSigned-off-by: default avatarWill Deacon <will@kernel.org>
parent 9ef2b48b
...@@ -22,6 +22,7 @@ ...@@ -22,6 +22,7 @@
#include <linux/device.h> #include <linux/device.h>
#include <linux/nospec.h> #include <linux/nospec.h>
#include <linux/prctl.h> #include <linux/prctl.h>
#include <linux/sched/task_stack.h>
#include <asm/spectre.h> #include <asm/spectre.h>
#include <asm/traps.h> #include <asm/traps.h>
......
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