From 99f8dc922033821edcc13f9f8360e9fda40dfcff Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Thu, 3 Jul 2014 01:28:45 +0530 Subject: [PATCH] Fix -Wundef warning on PAGE_COPY_THRESHOLD The PAGE_COPY_THRESHOLD macro is meant to be overridden by architecture-specific pagecopy.h, but it is currently done only by mach; all other architectures use the default. Check to see if the macro is defined in addition to whether it is set to a non-zero value. --- ChangeLog | 12 +++++++++++ debug/memcpy_chk.c | 1 - debug/mempcpy_chk.c | 1 - string/memcpy.c | 1 - string/memmove.c | 1 - sysdeps/generic/memcopy.h | 42 ++++++++++++++++++++++++++++++++++++ sysdeps/generic/pagecopy.h | 53 +++++++--------------------------------------- sysdeps/mach/pagecopy.h | 3 --- sysdeps/powerpc/memmove.c | 1 - 9 files changed, 62 insertions(+), 53 deletions(-) diff --git a/ChangeLog b/ChangeLog index 06b31ff..b523896 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,15 @@ +2014-07-02 Siddhesh Poyarekar + + * debug/memcpy_chk.c: Don't include pagecopy.h. + * debug/mempcpy_chk.c: Likewise. + * string/memcpy.c: Likewise. + * string/memmove.c: Likewise. + * sysdeps/powerpc/memmove.c: Likewise. + * sysdeps/generic/memcopy.h: Include pagecopy.h. Move + definition of PAGE_COPY_FWD_MAYBE here... + * sysdeps/generic/pagecopy.h: ... from here. + * sysdeps/mach/pagecopy.h: Don't include generic pagecopy.h. + 2014-07-02 Vidya Ranganathan Adhemerval Zanella diff --git a/debug/memcpy_chk.c b/debug/memcpy_chk.c index 9bf5d9f..539b7e2 100644 --- a/debug/memcpy_chk.c +++ b/debug/memcpy_chk.c @@ -20,7 +20,6 @@ #include #include -#include void * __memcpy_chk (dstpp, srcpp, len, dstlen) diff --git a/debug/mempcpy_chk.c b/debug/mempcpy_chk.c index 105356f..3ca916b 100644 --- a/debug/mempcpy_chk.c +++ b/debug/mempcpy_chk.c @@ -21,7 +21,6 @@ #include #include -#include void * __mempcpy_chk (dstpp, srcpp, len, dstlen) diff --git a/string/memcpy.c b/string/memcpy.c index c19bad3..517f9ee 100644 --- a/string/memcpy.c +++ b/string/memcpy.c @@ -20,7 +20,6 @@ #include #include -#include #undef memcpy diff --git a/string/memmove.c b/string/memmove.c index 3373401..22140ef 100644 --- a/string/memmove.c +++ b/string/memmove.c @@ -20,7 +20,6 @@ #include #include -#include /* All this is so that bcopy.c can #include this file after defining some things. */ diff --git a/sysdeps/generic/memcopy.h b/sysdeps/generic/memcopy.h index b39a960..45c5fcb 100644 --- a/sysdeps/generic/memcopy.h +++ b/sysdeps/generic/memcopy.h @@ -40,6 +40,7 @@ #include #include +#include /* The macros defined in this file are: @@ -144,6 +145,47 @@ extern void _wordcopy_bwd_dest_aligned (long int, long int, size_t) __THROW; (nbytes_left) = (nbytes) % OPSIZ; \ } while (0) +/* The macro PAGE_COPY_FWD_MAYBE (dstp, srcp, nbytes_left, nbytes) is invoked + like WORD_COPY_FWD et al. The pointers should be at least word aligned. + This will check if virtual copying by pages can and should be done and do it + if so. The pointers will be aligned to PAGE_SIZE bytes. The macro requires + that pagecopy.h defines at least PAGE_COPY_THRESHOLD to 0. If + PAGE_COPY_THRESHOLD is non-zero, the header must also define PAGE_COPY_FWD + and PAGE_SIZE. +*/ +#if PAGE_COPY_THRESHOLD + +# include + +# define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) \ + do \ + { \ + if ((nbytes) >= PAGE_COPY_THRESHOLD && \ + PAGE_OFFSET ((dstp) - (srcp)) == 0) \ + { \ + /* The amount to copy is past the threshold for copying \ + pages virtually with kernel VM operations, and the \ + source and destination addresses have the same alignment. */ \ + size_t nbytes_before = PAGE_OFFSET (-(dstp)); \ + if (nbytes_before != 0) \ + { \ + /* First copy the words before the first page boundary. */ \ + WORD_COPY_FWD (dstp, srcp, nbytes_left, nbytes_before); \ + assert (nbytes_left == 0); \ + nbytes -= nbytes_before; \ + } \ + PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \ + } \ + } while (0) + +/* The page size is always a power of two, so we can avoid modulo division. */ +# define PAGE_OFFSET(n) ((n) & (PAGE_SIZE - 1)) + +#else + +# define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) /* nada */ + +#endif /* Threshold value for when to enter the unrolled loops. */ #define OP_T_THRES 16 diff --git a/sysdeps/generic/pagecopy.h b/sysdeps/generic/pagecopy.h index 2c35b71..3c81de1 100644 --- a/sysdeps/generic/pagecopy.h +++ b/sysdeps/generic/pagecopy.h @@ -1,4 +1,4 @@ -/* Macros for copying by pages; used in memcpy, memmove. Generic macros. +/* Macros for copying by pages; used in memcpy, memmove. Copyright (C) 1995-2014 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -16,19 +16,15 @@ License along with the GNU C Library; if not, see . */ -/* This file defines the macro: +/* The macro PAGE_COPY_FWD_MAYBE defined in memcopy.h is used in memmove if the + PAGE_COPY_THRESHOLD macro is set to a non-zero value. The default is 0, + that is copying by pages is not implemented. - PAGE_COPY_FWD_MAYBE (dstp, srcp, nbytes_left, nbytes) - - which is invoked like WORD_COPY_FWD et al. The pointers should be at - least word aligned. This will check if virtual copying by pages can and - should be done and do it if so. - - System-specific pagecopy.h files should define these macros and then - #include this file: + System-specific pagecopy.h files that want to support page copying should + define these macros: PAGE_COPY_THRESHOLD - -- Minimum size for which virtual copying by pages is worthwhile. + -- A non-zero minimum size for which virtual copying by pages is worthwhile. PAGE_SIZE -- Size of a page. @@ -38,37 +34,4 @@ The pointers will be aligned to PAGE_SIZE bytes. */ - -#if PAGE_COPY_THRESHOLD - -#include - -#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) \ - do \ - { \ - if ((nbytes) >= PAGE_COPY_THRESHOLD && \ - PAGE_OFFSET ((dstp) - (srcp)) == 0) \ - { \ - /* The amount to copy is past the threshold for copying \ - pages virtually with kernel VM operations, and the \ - source and destination addresses have the same alignment. */ \ - size_t nbytes_before = PAGE_OFFSET (-(dstp)); \ - if (nbytes_before != 0) \ - { \ - /* First copy the words before the first page boundary. */ \ - WORD_COPY_FWD (dstp, srcp, nbytes_left, nbytes_before); \ - assert (nbytes_left == 0); \ - nbytes -= nbytes_before; \ - } \ - PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \ - } \ - } while (0) - -/* The page size is always a power of two, so we can avoid modulo division. */ -#define PAGE_OFFSET(n) ((n) & (PAGE_SIZE - 1)) - -#else - -#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) /* nada */ - -#endif +#define PAGE_COPY_THRESHOLD 0 diff --git a/sysdeps/mach/pagecopy.h b/sysdeps/mach/pagecopy.h index 36c3697..8db2147 100644 --- a/sysdeps/mach/pagecopy.h +++ b/sysdeps/mach/pagecopy.h @@ -30,6 +30,3 @@ (vm_address_t) dstp) == KERN_SUCCESS \ ? trunc_page (nbytes) \ : 0))) - -/* Get the generic macro. */ -#include diff --git a/sysdeps/powerpc/memmove.c b/sysdeps/powerpc/memmove.c index 3859da8..98ffb14 100644 --- a/sysdeps/powerpc/memmove.c +++ b/sysdeps/powerpc/memmove.c @@ -20,7 +20,6 @@ #include #include -#include /* All this is so that bcopy.c can #include this file after defining some things. */ -- 2.7.4