[U-Boot] [PATCH 1/7] dtc: Enable and fix -Wpointer-arith warnings

gvb.uboot at gmail.com
2008-08-20T02:30:32Z

From: David Gibson <david@gibson.dropbear.id.au>

This patch turns on the -Wpointer-arith option in the dtc Makefile,
and fixes the resulting warnings due to using (void *) in pointer
arithmetic. While convenient, pointer arithmetic on void * is not
portable, so it's better that we avoid it, particularly in libfdt.

Also add necessary definition of uintptr_t needed by David Gibson's
changeset "dtc: Enable and fix -Wpointer-arith warnings" (the definition
comes from stdint.h, which u-boot doesn't have). -- gvb

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>
---
include/libfdt_env.h | 12 +++++++++++
libfdt/fdt.c | 2 +-
libfdt/fdt_ro.c | 4 +-
libfdt/fdt_rw.c | 49 +++++++++++++++++++++++++--------------------
libfdt/fdt_sw.c | 2 +-
libfdt/fdt_wip.c | 2 +-
libfdt/libfdt_internal.h | 6 ++--
7 files changed, 47 insertions(+), 30 deletions(-)

diff --git a/include/libfdt_env.h b/include/libfdt_env.h
index a7fd2f8..671c3a8 100644
--- a/include/libfdt_env.h
+++ b/include/libfdt_env.h
@@ -38,4 +38,16 @@ extern struct fdt_header *working_fdt; /* Pointer to the working fdt */
#define fdt64_to_cpu(x) __be64_to_cpu(x)
#define cpu_to_fdt64(x) __cpu_to_be64(x)

+/*
+ * Types for `void *' pointers.
+ *
+ * Note: libfdt uses this definition from /usr/include/stdint.h.
+ * Define it here rather than pulling in all of stdint.h.
+ */
+#if __WORDSIZE == 64
+typedef unsigned long int uintptr_t;
+#else
+typedef unsigned int uintptr_t;
+#endif
+
#endif /* _LIBFDT_ENV_H */
diff --git a/libfdt/fdt.c b/libfdt/fdt.c
index cb08ba0..18e8d3c 100644
--- a/libfdt/fdt.c
+++ b/libfdt/fdt.c
@@ -80,7 +80,7 @@ int fdt_check_header(const void *fdt)

const void *fdt_offset_ptr(const void *fdt, int offset, int len)
{
- const void *p;
+ const char *p;

if (fdt_version(fdt) >= 0x11)
if (((offset + len) < offset)
diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index 69af7bb..8382afd 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -412,10 +412,10 @@ int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
&phandle, sizeof(phandle));
}

-int _stringlist_contains(const void *strlist, int listlen, const char *str)
+int _stringlist_contains(const char *strlist, int listlen, const char *str)
{
int len = strlen(str);
- const void *p;
+ const char *p;

while (listlen >= len) {
if (memcmp(str, strlist, len+1) == 0)
diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c
index 95a5c2c..4a16014 100644
--- a/libfdt/fdt_rw.c
+++ b/libfdt/fdt_rw.c
@@ -98,13 +98,14 @@ static inline int _blob_data_size(void *fdt)
return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
}

-static int _blob_splice(void *fdt, void *p, int oldlen, int newlen)
+static int _blob_splice(void *fdt, void *splicepoint, int oldlen, int newlen)
{
- void *end = fdt + _blob_data_size(fdt);
+ char *p = splicepoint;
+ char *end = (char *)fdt + _blob_data_size(fdt);

if (((p + oldlen) < p) || ((p + oldlen) > end))
return -FDT_ERR_BADOFFSET;
- if ((end - oldlen + newlen) > (fdt + fdt_totalsize(fdt)))
+ if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
return -FDT_ERR_NOSPACE;
memmove(p + newlen, p + oldlen, end - p - oldlen);
return 0;
@@ -139,7 +140,8 @@ static int _blob_splice_struct(void *fdt, void *p,

static int _blob_splice_string(void *fdt, int newlen)
{
- void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+ void *p = (char *)fdt
+ + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
int err;

if ((err = _blob_splice(fdt, p, 0, newlen)))
@@ -342,7 +344,7 @@ int fdt_add_subnode_namelen(void *fdt, int parentoffset,
nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
memset(nh->name, 0, ALIGN(namelen+1, FDT_TAGSIZE));
memcpy(nh->name, name, namelen);
- endtag = (uint32_t *)((void *)nh + nodelen - FDT_TAGSIZE);
+ endtag = (uint32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
*endtag = cpu_to_fdt32(FDT_END_NODE);

return offset;
@@ -367,7 +369,7 @@ int fdt_del_node(void *fdt, int nodeoffset)
endoffset - nodeoffset, 0);
}

-static void _packblocks(const void *fdt, void *buf,
+static void _packblocks(const char *old, char *new,
int mem_rsv_size, int struct_size)
{
int mem_rsv_off, struct_off, strings_off;
@@ -376,17 +378,17 @@ static void _packblocks(const void *fdt, void *buf,
struct_off = mem_rsv_off + mem_rsv_size;
strings_off = struct_off + struct_size;

- memmove(buf + mem_rsv_off, fdt + fdt_off_mem_rsvmap(fdt), mem_rsv_size);
- fdt_set_off_mem_rsvmap(buf, mem_rsv_off);
+ memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
+ fdt_set_off_mem_rsvmap(new, mem_rsv_off);

- memmove(buf + struct_off, fdt + fdt_off_dt_struct(fdt), struct_size);
- fdt_set_off_dt_struct(buf, struct_off);
- fdt_set_size_dt_struct(buf, struct_size);
+ memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
+ fdt_set_off_dt_struct(new, struct_off);
+ fdt_set_size_dt_struct(new, struct_size);

- memmove(buf + strings_off, fdt + fdt_off_dt_strings(fdt),
- fdt_size_dt_strings(fdt));
- fdt_set_off_dt_strings(buf, strings_off);
- fdt_set_size_dt_strings(buf, fdt_size_dt_strings(fdt));
+ memmove(new + strings_off, old + fdt_off_dt_strings(old),
+ fdt_size_dt_strings(old));
+ fdt_set_off_dt_strings(new, strings_off);
+ fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
}

int fdt_open_into(const void *fdt, void *buf, int bufsize)
@@ -394,7 +396,9 @@ int fdt_open_into(const void *fdt, void *buf, int bufsize)
int err;
int mem_rsv_size, struct_size;
int newsize;
- void *tmp;
+ const char *fdtstart = fdt;
+ const char *fdtend = fdtstart + fdt_totalsize(fdt);
+ char *tmp;

CHECK_HEADER(fdt);

@@ -427,12 +431,13 @@ int fdt_open_into(const void *fdt, void *buf, int bufsize)
if (bufsize < newsize)
return -FDT_ERR_NOSPACE;

- if (((buf + newsize) <= fdt)
- || (buf >= (fdt + fdt_totalsize(fdt)))) {
- tmp = buf;
- } else {
- tmp = (void *)fdt + fdt_totalsize(fdt);
- if ((tmp + newsize) > (buf + bufsize))
+ /* First attempt to build converted tree at beginning of buffer */
+ tmp = buf;
+ /* But if that overlaps with the old tree... */
+ if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
+ /* Try right after the old tree instead */
+ tmp = (char *)fdtend;
+ if ((tmp + newsize) > ((char *)buf + bufsize))
return -FDT_ERR_NOSPACE;
}

diff --git a/libfdt/fdt_sw.c b/libfdt/fdt_sw.c
index df09876..92f8f0b 100644
--- a/libfdt/fdt_sw.c
+++ b/libfdt/fdt_sw.c
@@ -121,7 +121,7 @@ int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
return -FDT_ERR_NOSPACE;

- re = (struct fdt_reserve_entry *)(fdt + offset);
+ re = (struct fdt_reserve_entry *)((char *)fdt + offset);
re->address = cpu_to_fdt64(addr);
re->size = cpu_to_fdt64(size);

diff --git a/libfdt/fdt_wip.c b/libfdt/fdt_wip.c
index 24e1724..b336113 100644
--- a/libfdt/fdt_wip.c
+++ b/libfdt/fdt_wip.c
@@ -80,7 +80,7 @@ static void nop_region(void *start, int len)
{
uint32_t *p;

- for (p = start; (void *)p < (start + len); p++)
+ for (p = start; (char *)p < ((char *)start + len); p++)
*p = cpu_to_fdt32(FDT_NOP);
}

diff --git a/libfdt/libfdt_internal.h b/libfdt/libfdt_internal.h
index f72e70d..2ba30db 100644
--- a/libfdt/libfdt_internal.h
+++ b/libfdt/libfdt_internal.h
@@ -72,7 +72,7 @@ int _fdt_node_end_offset(void *fdt, int nodeoffset);

static inline const void *_fdt_offset_ptr(const void *fdt, int offset)
{
- return fdt + fdt_off_dt_struct(fdt) + offset;
+ return (const char *)fdt + fdt_off_dt_struct(fdt) + offset;
}

static inline void *_fdt_offset_ptr_w(void *fdt, int offset)
@@ -82,8 +82,8 @@ static inline void *_fdt_offset_ptr_w(void *fdt, int offset)

static inline const struct fdt_reserve_entry *_fdt_mem_rsv(const void *fdt, int n)
{
- const struct fdt_reserve_entry *rsv_table =
- fdt + fdt_off_mem_rsvmap(fdt);
+ const struct fdt_reserve_entry *rsv_table = (struct fdt_reserve_entry *)
+ ((const char *)fdt + fdt_off_mem_rsvmap(fdt));

return rsv_table + n;
}
--
1.5.6.3