diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2021-08-11 08:30:26 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2021-08-20 11:39:27 +0100 |
| commit | 8ac6f5d7f84bf362e67591708bcb9788cdc42c50 (patch) | |
| tree | b550f0848c7bf5a43991f70ad71937b560d49dc5 /arch/arm/lib | |
| parent | 2df4c9a741a0b5e2883cc356c1b724d1f739fb55 (diff) | |
| download | linux-8ac6f5d7f84bf362e67591708bcb9788cdc42c50.tar.bz2 | |
ARM: 9113/1: uaccess: remove set_fs() implementation
There are no remaining callers of set_fs(), so just remove it
along with all associated code that operates on
thread_info->addr_limit.
There are still further optimizations that can be done:
- In get_user(), the address check could be moved entirely
into the out of line code, rather than passing a constant
as an argument,
- I assume the DACR handling can be simplified as we now
only change it during user access when CONFIG_CPU_SW_DOMAIN_PAN
is set, but not during set_fs().
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/copy_from_user.S | 3 | ||||
| -rw-r--r-- | arch/arm/lib/copy_to_user.S | 3 |
2 files changed, 2 insertions, 4 deletions
diff --git a/arch/arm/lib/copy_from_user.S b/arch/arm/lib/copy_from_user.S index f8016e3db65d..480a20766137 100644 --- a/arch/arm/lib/copy_from_user.S +++ b/arch/arm/lib/copy_from_user.S @@ -109,8 +109,7 @@ ENTRY(arm_copy_from_user) #ifdef CONFIG_CPU_SPECTRE - get_thread_info r3 - ldr r3, [r3, #TI_ADDR_LIMIT] + ldr r3, =TASK_SIZE uaccess_mask_range_ptr r1, r2, r3, ip #endif diff --git a/arch/arm/lib/copy_to_user.S b/arch/arm/lib/copy_to_user.S index ebfe4cb3d912..842ea5ede485 100644 --- a/arch/arm/lib/copy_to_user.S +++ b/arch/arm/lib/copy_to_user.S @@ -109,8 +109,7 @@ ENTRY(__copy_to_user_std) WEAK(arm_copy_to_user) #ifdef CONFIG_CPU_SPECTRE - get_thread_info r3 - ldr r3, [r3, #TI_ADDR_LIMIT] + ldr r3, =TASK_SIZE uaccess_mask_range_ptr r0, r2, r3, ip #endif |