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| author | Thomas Gleixner <tglx@linutronix.de> | 2025-10-27 09:43:42 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-11-03 15:26:09 +0100 |
| commit | 44c5b6768e3a1385fdf3b10893404bc5a2c1248a (patch) | |
| tree | a29ea8d66f7f391c227c75517327a1e88ff763b4 /lib/dynamic_debug.c | |
| parent | 6146a0f1dfae5d37442a9ddcba012add260bceb0 (diff) | |
ARM: uaccess: Implement missing __get_user_asm_dword()
When CONFIG_CPU_SPECTRE=n then get_user() is missing the 8 byte ASM variant
for no real good reason. This prevents using get_user(u64) in generic code.
Implement it as a sequence of two 4-byte reads with LE/BE awareness and
make the unsigned long (or long long) type for the intermediate variable to
read into dependend on the the target type.
The __long_type() macro and idea was lifted from PowerPC. Thanks to
Christophe for pointing it out.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509120155.pFgwfeUD-lkp@intel.com/
Link: https://patch.msgid.link/20251027083745.168468637@linutronix.de
Diffstat (limited to 'lib/dynamic_debug.c')
0 files changed, 0 insertions, 0 deletions