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authorArnd Bergmann <arnd@arndb.de>2022-02-11 21:42:45 +0100
committerArnd Bergmann <arnd@arndb.de>2022-02-25 09:36:06 +0100
commit967747bbc084b93b54e66f9047d342232314cd25 (patch)
tree816678a5afa21612d3d420c2cd6fc61abc64cda1 /kernel/events
parente5ef21d139957b8d064fefb7db42d1525605dd98 (diff)
downloadlinux-967747bbc084b93b54e66f9047d342232314cd25.tar.bz2
uaccess: remove CONFIG_SET_FS
There are no remaining callers of set_fs(), so CONFIG_SET_FS can be removed globally, along with the thread_info field and any references to it. This turns access_ok() into a cheaper check against TASK_SIZE_MAX. As CONFIG_SET_FS is now gone, drop all remaining references to set_fs()/get_fs(), mm_segment_t, user_addr_max() and uaccess_kernel(). Acked-by: Sam Ravnborg <sam@ravnborg.org> # for sparc32 changes Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Tested-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com> # for arc changes Acked-by: Stafford Horne <shorne@gmail.com> # [openrisc, asm-generic] Acked-by: Dinh Nguyen <dinguyen@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/callchain.c4
-rw-r--r--kernel/events/core.c3
2 files changed, 0 insertions, 7 deletions
diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
index 58cbe357fb2b..1273be84392c 100644
--- a/kernel/events/callchain.c
+++ b/kernel/events/callchain.c
@@ -209,17 +209,13 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
}
if (regs) {
- mm_segment_t fs;
-
if (crosstask)
goto exit_put;
if (add_mark)
perf_callchain_store_context(&ctx, PERF_CONTEXT_USER);
- fs = force_uaccess_begin();
perf_callchain_user(&ctx, regs);
- force_uaccess_end(fs);
}
}
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 57c7197838db..11ca7303d6df 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6746,7 +6746,6 @@ perf_output_sample_ustack(struct perf_output_handle *handle, u64 dump_size,
unsigned long sp;
unsigned int rem;
u64 dyn_size;
- mm_segment_t fs;
/*
* We dump:
@@ -6764,9 +6763,7 @@ perf_output_sample_ustack(struct perf_output_handle *handle, u64 dump_size,
/* Data. */
sp = perf_user_stack_pointer(regs);
- fs = force_uaccess_begin();
rem = __output_copy_user(handle, (void *) sp, dump_size);
- force_uaccess_end(fs);
dyn_size = dump_size - rem;
perf_output_skip(handle, rem);