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Anton Ivanov ccc9ed2449 um: Avoid marking pages with "changed protection" 
[ Upstream commit 8892d8545f2d0342b9c550defbfb165db237044b ]

Changing protection is a very high cost operation in UML
because in addition to an extra syscall it also interrupts
mmap merge sequences generated by the tlb.

While the condition is not particularly common it is worth
avoiding.

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-02-20 10:13:13 +01:00
..
alpha arch/alpha, termios: implement BOTHER, IBSHIFT and termios2 2018-11-21 09:27:42 +01:00
arc ARC: perf: map generic branches to correct hardware condition 2019-02-06 19:43:03 +01:00
arm arm64: KVM: Skip MMIO insn after emulation 2019-02-20 10:13:10 +01:00
arm64 arm64: ftrace: don't adjust the LR value 2019-02-20 10:13:07 +01:00
avr32
blackfin
c6x
cris mm: replace get_user_pages() write/force parameters with gup_flags 2018-12-17 21:55:16 +01:00
frv futex: Remove duplicated code and fix undefined behaviour 2018-05-26 08:48:50 +02:00
h8300
hexagon hexagon: modify ffs() and fls() to return int 2018-10-10 08:52:12 +02:00
ia64 mm: replace get_user_pages() write/force parameters with gup_flags 2018-12-17 21:55:16 +01:00
m32r
m68k m68k: fix "bad page state" oops on ColdFire boot 2018-08-24 13:26:57 +02:00
metag
microblaze microblaze: Fix simpleImage format generation 2018-08-06 16:24:39 +02:00
mips mips: bpf: fix encoding bug for mm_srlv32_op 2019-02-20 10:13:08 +01:00
mn10300 mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy 2018-02-16 20:09:47 +01:00
nios2
openrisc kthread: fix boot hang (regression) on MIPS/OpenRISC 2018-09-19 22:48:55 +02:00
parisc parisc: Fix map_pages() to not overwrite existing pte entries 2018-11-21 09:27:30 +01:00
powerpc powerpc/uaccess: fix warning/error with access_ok() 2019-02-20 10:13:10 +01:00
s390 s390/smp: Fix calling smp_call_ipl_cpu() from ipl CPU 2019-02-06 19:43:05 +01:00
score
sh mm: replace get_user_pages_unlocked() write/force parameters with gup_flags 2018-12-17 21:55:16 +01:00
sparc mm: replace get_user_pages_unlocked() write/force parameters with gup_flags 2018-12-17 21:55:16 +01:00
tile futex: Remove duplicated code and fix undefined behaviour 2018-05-26 08:48:50 +02:00
um um: Avoid marking pages with "changed protection" 2019-02-20 10:13:13 +01:00
unicore32
x86 KVM: x86: svm: report MSR_IA32_MCG_EXT_CTL as unsupported 2019-02-20 10:13:12 +01:00
xtensa xtensa: fix coprocessor context offset definitions 2018-12-13 09:21:26 +01:00
.gitignore
Kconfig