modules: don't export section names of empty sections via sysfs
On the parisc architecture we face for each and every loaded kernel module this kernel "badness warning": sysfs: cannot create duplicate filename '/module/ac97_bus/sections/.text' Badness at fs/sysfs/dir.c:487 Reason for that is, that on parisc all kernel modules do have multiple .text sections due to the usage of the -ffunction-sections compiler flag which is needed to reach all jump targets on this platform. An objdump on such a kernel module gives: Sections: Idx Name Size VMA LMA File off Algn 0 .note.gnu.build-id 00000024 00000000 00000000 00000034 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 1 .text 00000000 00000000 00000000 00000058 2**0 CONTENTS, ALLOC, LOAD, READONLY, CODE 2 .text.ac97_bus_match 0000001c 00000000 00000000 00000058 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 3 .text 00000000 00000000 00000000 000000d4 2**0 CONTENTS, ALLOC, LOAD, READONLY, CODE ... Since the .text sections are empty (size of 0 bytes) and won't be loaded by the kernel module loader anyway, I don't see a reason why such sections need to be listed under /sys/module/<module_name>/sections/<section_name> either. The attached patch does solve this issue by not exporting section names which are empty. This fixes bugzilla http://bugzilla.kernel.org/show_bug.cgi?id=14703 Signed-off-by: Helge Deller <deller@gmx.de> CC: rusty@rustcorp.com.au CC: akpm@linux-foundation.org CC: James.Bottomley@HansenPartnership.com CC: roland@redhat.com CC: dave@hiauly1.hia.nrc.ca Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1187,7 +1187,8 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
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/* Count loaded sections and allocate structures */
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for (i = 0; i < nsect; i++)
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if (sechdrs[i].sh_flags & SHF_ALLOC)
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if (sechdrs[i].sh_flags & SHF_ALLOC
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&& sechdrs[i].sh_size)
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nloaded++;
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size[0] = ALIGN(sizeof(*sect_attrs)
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+ nloaded * sizeof(sect_attrs->attrs[0]),
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@ -1207,6 +1208,8 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
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for (i = 0; i < nsect; i++) {
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if (! (sechdrs[i].sh_flags & SHF_ALLOC))
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continue;
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if (!sechdrs[i].sh_size)
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continue;
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sattr->address = sechdrs[i].sh_addr;
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sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
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GFP_KERNEL);
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