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| author | Mark Rutland <mark.rutland@arm.com> | 2020-12-02 13:15:47 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-12-02 19:46:14 +0000 |
| commit | a0ccf2ba689f773f2882b9c1e79d8a43a19cb513 (patch) | |
| tree | 1e934a4feafb46f63dcf394b4e224f51249bf718 /drivers/firmware | |
| parent | d87a8e65b5101123a24cddeb7a8a2c7b45f7b60c (diff) | |
| download | linux-a0ccf2ba689f773f2882b9c1e79d8a43a19cb513.tar.bz2 | |
arm64: sdei: move uaccess logic to arch/arm64/
The SDEI support code is split across arch/arm64/ and drivers/firmware/,
largley this is split so that the arch-specific portions are under
arch/arm64, and the management logic is under drivers/firmware/.
However, exception entry fixups are currently under drivers/firmware.
Let's move the exception entry fixups under arch/arm64/. This
de-clutters the management logic, and puts all the arch-specific
portions in one place. Doing this also allows the fixups to be applied
earlier, so things like PAN and UAO will be in a known good state before
we run other logic. This will also make subsequent refactoring easier.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201202131558.39270-2-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/arm_sdei.c | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c index 840754dcc6ca..a7e762c352f9 100644 --- a/drivers/firmware/arm_sdei.c +++ b/drivers/firmware/arm_sdei.c @@ -31,7 +31,6 @@ #include <linux/slab.h> #include <linux/smp.h> #include <linux/spinlock.h> -#include <linux/uaccess.h> /* * The call to use to reach the firmware. @@ -1092,26 +1091,13 @@ int sdei_event_handler(struct pt_regs *regs, struct sdei_registered_event *arg) { int err; - mm_segment_t orig_addr_limit; u32 event_num = arg->event_num; - /* - * Save restore 'fs'. - * The architecture's entry code save/restores 'fs' when taking an - * exception from the kernel. This ensures addr_limit isn't inherited - * if you interrupted something that allowed the uaccess routines to - * access kernel memory. - * Do the same here because this doesn't come via the same entry code. - */ - orig_addr_limit = force_uaccess_begin(); - err = arg->callback(event_num, regs, arg->callback_arg); if (err) pr_err_ratelimited("event %u on CPU %u failed with error: %d\n", event_num, smp_processor_id(), err); - force_uaccess_end(orig_addr_limit); - return err; } NOKPROBE_SYMBOL(sdei_event_handler); |