BackPup/Linux
1
0 Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-07 05:31:08 -04:00
Code Issues Packages Projects Releases Wiki Activity

arm64/sve: Delay freeing memory in fpsimd_flush_thread()

Browse Source 
fpsimd_flush_thread() invokes kfree() via sve_free()+sme_free() within a
preempt disabled section which is not working on -RT.

Delay freeing of memory until preemption is enabled again.

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Sebastian Andrzej Siewior authored and Catalin Marinas committed 2022-05-16 19:15:45 +01:00
1 parent d158a0608e
commit a1259dd807
1 file changed
+15 -2
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/kernel/fpsimd.c
+15 -2
View File
@@ -1562,6 +1562,9 @@ static void fpsimd_flush_thread_vl(enum vec_type type)
void fpsimd_flush_thread(void)
{
void *sve_state = NULL;
void *za_state = NULL;
if (!system_supports_fpsimd())
return;
@@ -1573,18 +1576,28 @@ void fpsimd_flush_thread(void)
if (system_supports_sve()) {
clear_thread_flag(TIF_SVE);
sve_free(current);
/* Defer kfree() while in atomic context */
sve_state = current->thread.sve_state;
current->thread.sve_state = NULL;
fpsimd_flush_thread_vl(ARM64_VEC_SVE);
}
if (system_supports_sme()) {
clear_thread_flag(TIF_SME);
sme_free(current);
/* Defer kfree() while in atomic context */
za_state = current->thread.za_state;
current->thread.za_state = NULL;
fpsimd_flush_thread_vl(ARM64_VEC_SME);
current->thread.svcr = 0;
}
put_cpu_fpsimd_context();
kfree(sve_state);
kfree(za_state);
}
/*