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authorOleg Nesterov <oleg@redhat.com>2020-11-19 19:02:21 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2020-11-26 14:05:42 +0300
commit640586f8af356096e084d69a9909d217852bde48 (patch)
treef25479b356c791dfd0087c2fd5f7d18638d71d63 /include/linux/regset.h
parent20fa40b147bda9b976227c11ea7afb369827e7d4 (diff)
downloadlinux-640586f8af356096e084d69a9909d217852bde48.tar.xz
powerpc/ptrace: Simplify gpr_get()/tm_cgpr_get()
gpr_get() does membuf_write() twice to override pt_regs->msr in between. We can call membuf_write() once and change ->msr in the kernel buffer, this simplifies the code and the next fix. The patch adds a new simple helper, membuf_at(offs), it returns the new membuf which can be safely used after membuf_write(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> [mpe: Fixup some minor whitespace issues noticed by Christophe] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201119160221.GA5188@redhat.com
Diffstat (limited to 'include/linux/regset.h')
-rw-r--r--include/linux/regset.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/regset.h b/include/linux/regset.h
index c3403f328257..a00765f0e8cf 100644
--- a/include/linux/regset.h
+++ b/include/linux/regset.h
@@ -46,6 +46,18 @@ static inline int membuf_write(struct membuf *s, const void *v, size_t size)
return s->left;
}
+static inline struct membuf membuf_at(const struct membuf *s, size_t offs)
+{
+ struct membuf n = *s;
+
+ if (offs > n.left)
+ offs = n.left;
+ n.p += offs;
+ n.left -= offs;
+
+ return n;
+}
+
/* current s->p must be aligned for v; v must be a scalar */
#define membuf_store(s, v) \
({ \