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authorJoerg Roedel <jroedel@suse.de>2020-06-01 21:52:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-02 10:59:12 -0700
commit7f0a002b5a21302d9f4b29ba83c96cd433ff3769 (patch)
tree31b8e0998e5f29799b8d6912924ee46d53d087b2 /arch/x86/mm/pti.c
parent73f693c3a705756032c2863bfb37570276902d7d (diff)
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x86/mm: remove vmalloc faulting
Remove fault handling on vmalloc areas, as the vmalloc code now takes care of synchronizing changes to all page-tables in the system. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Andy Lutomirski <luto@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlastimil Babka <vbabka@suse.cz> Link: http://lkml.kernel.org/r/20200515140023.25469-8-joro@8bytes.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/mm/pti.c')
-rw-r--r--arch/x86/mm/pti.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 843aa10a4cb6..da0fb17a1a36 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -448,13 +448,7 @@ static void __init pti_clone_user_shared(void)
* the sp1 and sp2 slots.
*
* This is done for all possible CPUs during boot to ensure
- * that it's propagated to all mms. If we were to add one of
- * these mappings during CPU hotplug, we would need to take
- * some measure to make sure that every mm that subsequently
- * ran on that CPU would have the relevant PGD entry in its
- * pagetables. The usual vmalloc_fault() mechanism would not
- * work for page faults taken in entry_SYSCALL_64 before RSP
- * is set up.
+ * that it's propagated to all mms.
*/
unsigned long va = (unsigned long)&per_cpu(cpu_tss_rw, cpu);