From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Wed, 02 Dec 2015 14:54:18 +0100 Subject: [PATCH v6 14/19] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it In-Reply-To: <2623148.F7bGmbuQQh@wuerfel> References: <1447795019-30176-1-git-send-email-ynorov@caviumnetworks.com> <20151202103522.GB21461@yury-N73SV> <2623148.F7bGmbuQQh@wuerfel> Message-ID: <7159845.QvBivUPZSS@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday 02 December 2015 14:46:32 Arnd Bergmann wrote: > On Wednesday 02 December 2015 13:35:22 Yury Norov wrote: > > On Wed, Dec 02, 2015 at 09:37:05AM +0100, Arnd Bergmann wrote: > > > The 4*PAGE_SIZE on ARM is an architecture specific oddity, I believe > > > to work around aliasing caches on ARMv6. As no other architecture does > > > this, we're probably better off not duplicating it for aarch64-ilp32 > > > and just use sys_shmat as your v6 patch does. > > > Arnd > > > > If you feel ARMv6 fix for caches will come soon, just ignore it. > > Otherwise, please pull it because compat_sys_shmat is broken now > > for 64K pages. > > > > Signed-off-by: Yury Norov > > > > Sounds good. Will, do you want to take this for the arm64 tree. > > Acked-by: Arnd Bergmann (actually Cc Will Deacon) Will or Catalin, does this look ok to you? 8<---- Subject: fix COMPAT_SHMLBA definition for large pages From: Yury Norov ARM glibc uses (4 * __getpagesize()) for SHMLBA, which is correct for 4KB pages and works fine for 64KB pages, but the kernel uses a hardcoded 16KB that is too small for 64KB page based kernels. This changes the definition to what user space sees when using 64KB pages. Signed-off-by: Yury Norov Signed-off-by: Arnd Bergmann --- arch/arm64/include/asm/shmparam.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/shmparam.h b/arch/arm64/include/asm/shmparam.h index 4df608a..e368a55 100644 --- a/arch/arm64/include/asm/shmparam.h +++ b/arch/arm64/include/asm/shmparam.h @@ -21,7 +21,7 @@ * alignment value. Since we don't have aliasing D-caches, the rest of * the time we can safely use PAGE_SIZE. */ -#define COMPAT_SHMLBA 0x4000 +#define COMPAT_SHMLBA (4 * PAGE_SIZE) #include --