From c2b1a9226fe7c1cee8f0ae42496f3eb282d73ebb Mon Sep 17 00:00:00 2001 From: Leonardo Bras Date: Wed, 24 Oct 2018 01:03:52 -0300 Subject: [PATCH] modpost: Create macro to avoid variable shadowing Create DEF_FIELD_ADDR_VAR as a more generic version of the DEF_FIELD_ADD macro, allowing usage of a variable name other than the struct element name. Also, sets DEF_FIELD_ADDR as a specific usage of DEF_FILD_ADDR_VAR in which the var name is the same as the struct element name. Then, makes use of DEF_FIELD_ADDR_VAR to create a variable of another name, in order to avoid variable shadowing. Signed-off-by: Leonardo Bras Signed-off-by: Masahiro Yamada --- scripts/mod/file2alias.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index ba4ebc4b346e..28a61665bb9c 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -95,12 +95,20 @@ extern struct devtable *__start___devtable[], *__stop___devtable[]; */ #define DEF_FIELD(m, devid, f) \ typeof(((struct devid *)0)->f) f = TO_NATIVE(*(typeof(f) *)((m) + OFF_##devid##_##f)) + +/* Define a variable v that holds the address of field f of struct devid + * based at address m. Due to the way typeof works, for a field of type + * T[N] the variable has type T(*)[N], _not_ T*. + */ +#define DEF_FIELD_ADDR_VAR(m, devid, f, v) \ + typeof(((struct devid *)0)->f) *v = ((m) + OFF_##devid##_##f) + /* Define a variable f that holds the address of field f of struct devid * based at address m. Due to the way typeof works, for a field of type * T[N] the variable has type T(*)[N], _not_ T*. */ #define DEF_FIELD_ADDR(m, devid, f) \ - typeof(((struct devid *)0)->f) *f = ((m) + OFF_##devid##_##f) + DEF_FIELD_ADDR_VAR(m, devid, f, f) /* Add a table entry. We test function type matches while we're here. */ #define ADD_TO_DEVTABLE(device_id, type, function) \ @@ -644,7 +652,7 @@ static void do_pnp_card_entries(void *symval, unsigned long size, for (i = 0; i < count; i++) { unsigned int j; - DEF_FIELD_ADDR(symval + i*id_size, pnp_card_device_id, devs); + DEF_FIELD_ADDR(symval + i * id_size, pnp_card_device_id, devs); for (j = 0; j < PNP_MAX_DEVICES; j++) { const char *id = (char *)(*devs)[j].id; @@ -656,10 +664,13 @@ static void do_pnp_card_entries(void *symval, unsigned long size, /* find duplicate, already added value */ for (i2 = 0; i2 < i && !dup; i2++) { - DEF_FIELD_ADDR(symval + i2*id_size, pnp_card_device_id, devs); + DEF_FIELD_ADDR_VAR(symval + i2 * id_size, + pnp_card_device_id, + devs, devs_dup); for (j2 = 0; j2 < PNP_MAX_DEVICES; j2++) { - const char *id2 = (char *)(*devs)[j2].id; + const char *id2 = + (char *)(*devs_dup)[j2].id; if (!id2[0]) break;