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In order to ensure that all data in source page has been written back
to memory before copy_page, the local irq shall be disabled before
calling cpu_dcache_wb_page(). In addition, removing unneeded page
invalidation for 'to' page.
Signed-off-by: Vincent Chen <[email protected]>
Reviewed-by: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
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According to Documentation/cachetlb.txt, the cache of the page at vmaddr
shall be flushed in flush_anon_page instead of the cache of the page at
page_address(page).
Signed-off-by: Vincent Chen <[email protected]>
Reviewed-by: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
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1. Disable local irq before d-cache write-back and invalidate.
The cpu_dcache_wbinval_page function is composed of d-cache
write-back and invalidate. If the local irq is enabled when calling
cpu_dcache_wbinval_page, the content of d-cache is possibly updated
between write-back and invalidate. In this case, the updated data will
be dropped due to the following d-cache invalidation. Therefore, we
disable the local irq before calling cpu_dcache_wbinval_page.
2. Correct the data write-back for page aliasing case.
Only the page whose (page->index << PAGE_SHIFT) is located at the
same page color as page_address(page) needs to execute data write-back
in flush_dcache_page function.
Signed-off-by: Vincent Chen <[email protected]>
Reviewed-by: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
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If the kernel config 'CONFIG_ALIGNMENT_TRAP' and the file
'/proc/sys/nds32/unaligned_access/enable' are set, the kernel
unaligned access handler does not handle correctly when the
value of immediate field is negative. This commit fixes the
unaligned access handler in kernel.
Signed-off-by: Nickhu <[email protected]>
Reviewed-by: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
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Change the name of the file '/proc/sys/nds32/unaligned_acess'
to '/proc/sys/nds32/unaligned_access'
Signed-off-by: Nickhu <[email protected]>
Reviewed-by: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
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It broke the 'allmodconfig' build.
LD vmlinux
SYSMAP System.map
Building modules, stage 2.
MODPOST 5028 modules
ERROR: "flush_dcache_page" [net/sunrpc/xprtrdma/rpcrdma.ko] undefined!
ERROR: "empty_zero_page" [net/ceph/libceph.ko] undefined!
ERROR: "save_stack_trace" [kernel/backtracetest.ko] undefined!
ERROR: "clear_page" [fs/ocfs2/dlm/ocfs2_dlm.ko] undefined!
ERROR: "copy_page" [fs/nilfs2/nilfs2.ko] undefined!
...
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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flush_kernel_vmap_range
It broke the 'allmodconfig' build.
fs/xfs/xfs_buf.c: In function 'xfs_buf_bio_end_io':
fs/xfs/xfs_buf.c:1242:3: error: implicit declaration of function 'invalidate_kernel_vmap_range' [-Werror=implicit-function-declaration]
invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/xfs/xfs_buf.c: In function 'xfs_buf_ioapply_map':
fs/xfs/xfs_buf.c:1312:4: error: implicit declaration of function 'flush_kernel_vmap_range' [-Werror=implicit-function-declaration]
flush_kernel_vmap_range(bp->b_addr,
^~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Greentime Hu <[email protected]>
Cc: Vincent Chen <[email protected]>
Acked-by: Vincent Chen <[email protected]>
Signed-off-by: "Eric W. Biederman" <[email protected]>
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Call clear_siginfo to ensure every stack allocated siginfo is properly
initialized before being passed to the signal sending functions.
Note: It is not safe to depend on C initializers to initialize struct
siginfo on the stack because C is allowed to skip holes when
initializing a structure.
The initialization of struct siginfo in tracehook_report_syscall_exit
was moved from the helper user_single_step_siginfo into
tracehook_report_syscall_exit itself, to make it clear that the local
variable siginfo gets fully initialized.
In a few cases the scope of struct siginfo has been reduced to make it
clear that siginfo siginfo is not used on other paths in the function
in which it is declared.
Instances of using memset to initialize siginfo have been replaced
with calls clear_siginfo for clarity.
Signed-off-by: "Eric W. Biederman" <[email protected]>
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This patch adds Makefile, Kconfig and vmlinux.lds.S files required for building
an nds32 kernel.
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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This patch introduces ioremap implementations.
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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This patch contains cache and TLB maintenance functions.
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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This patch includes page fault handler, mmap and fixup implementations.
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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This patch includes memory initializations and highmem supporting.
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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This patch includes the exception/interrupt entries, pt_reg structure and
related accessors.
/* Unaligned accessing handling*/
Andes processors cannot load/store information which is not naturally
aligned on the bus, i.e., loading a 4 byte data whose start address must
be divisible by 4. If unaligned data accessing is happened, data
unaligned exception will be triggered and user will get SIGSEGV or
kernel oops according to the unaligned address. In order to make user be
able to load/store data from an unaligned address, software load/store
emulation is implemented in arch/nds32/mm/alignment.c to address data
unaligned exception.
Unaligned accessing handling is disabled by default because it is not a
normal case. User can enable this feature by following steps.
A. Compile time:
1. Enable kernel config CONFIG_ALIGNMENT_TRAP
B. Run time:
1. Enter /proc/sys/nds32/unaligned_acess folder
2. Write 1 to file enable_mode to enable unaligned accessing
handling. User can disable it by writing 0 to this file.
3. Write 1 to file debug to show which unaligned address is under
processing. User can disable it by writing 0 to this file.
However, unaligned accessing handler cannot work if this unaligned
address is not accessible such as protection violation. On this
condition, the default behaviors for addressing data unaligned exception
still happen
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
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