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Arnd Bergmann 41dd6b0ec7 sh: rework sync_file_range ABI 
commit 30766f1105 upstream.

The unusual function calling conventions on SuperH ended up causing
sync_file_range to have the wrong argument order, with the 'flags'
argument getting sorted before 'nbytes' by the compiler.

In userspace, I found that musl, glibc, uclibc and strace all expect the
normal calling conventions with 'nbytes' last, so changing the kernel
to match them should make all of those work.

In order to be able to also fix libc implementations to work with existing
kernels, they need to be able to tell which ABI is used. An easy way
to do this is to add yet another system call using the sync_file_range2
ABI that works the same on all architectures.

Old user binaries can now work on new kernels, and new binaries can
try the new sync_file_range2() to work with new kernels or fall back
to the old sync_file_range() version if that doesn't exist.

Cc: stable@vger.kernel.org
Fixes: 75c92acdd5 ("sh: Wire up new syscalls.")
Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-07-05 09:31:57 +02:00
..
boards sh: boards: Fix CEU buffer size passed to dma_declare_coherent_memory() 2023-09-19 12:28:04 +02:00
boot mmc: sh_mmcif: move platform_data header to proper location 2022-04-26 14:05:21 +02:00
cchips sh: hd64461: Handle virq offset for offchip IRQ base and HD64461 IRQ 2023-07-19 16:22:18 +02:00
configs - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
drivers sh: dma: Fix DMA channel offset calculation 2023-07-19 16:22:07 +02:00
include sh/cpu: Switch to arch_cpu_finalize_init() 2023-08-08 20:03:47 +02:00
kernel sh: rework sync_file_range ABI 2024-07-05 09:31:57 +02:00
lib Revert "sh: Handle calling csum_partial with misaligned data" 2024-06-12 11:03:15 +02:00
math-emu sh: math-emu: fix macro redefined warning 2023-05-17 11:53:44 +02:00
mm mm/fault: convert remaining simple cases to lock_mm_and_find_vma() 2023-07-01 13:16:25 +02:00
tools sh: Remove SH5-based Cayman platform 2020-08-14 22:05:06 -04:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig sh/cpu: Switch to arch_cpu_finalize_init() 2023-08-08 20:03:47 +02:00
Kconfig.cpu docs: sh: convert register-banks.txt to ReST 2020-06-19 14:10:13 -06:00
Kconfig.debug sh: bios: Revive earlyprintk support 2023-11-20 11:52:07 +01:00
Makefile kbuild: remove head-y syntax 2022-10-02 18:06:03 +09:00