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https://github.com/torvalds/linux
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93048c0944
kbuild robot reports that since commitce76d938dd("lib: Add memcat_p(): paste 2 pointer arrays together") the ia64/hp/sim/boot fails to link: > LD arch/ia64/hp/sim/boot/bootloader > lib/string.o: In function `__memcat_p': > string.c:(.text+0x1f22): undefined reference to `__kmalloc' > string.c:(.text+0x1ff2): undefined reference to `__kmalloc' > make[1]: *** [arch/ia64/hp/sim/boot/Makefile:37: arch/ia64/hp/sim/boot/bootloader] Error 1 The reason is, the above commit, via __memcat_p(), adds a call to __kmalloc to string.o, which happens to be used in the bootloader, but there's no kmalloc or slab or anything. Since the linker would only pull in objects that contain referenced symbols, moving __memcat_p() to a different compilation unit solves the problem. Fixes:ce76d938dd("lib: Add memcat_p(): paste 2 pointer arrays together") Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reported-by: kbuild test robot <lkp@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Test cases for memcat_p() in lib/memcat_p.c
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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struct test_struct {
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int num;
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unsigned int magic;
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};
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#define MAGIC 0xf00ff00f
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/* Size of each of the NULL-terminated input arrays */
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#define INPUT_MAX 128
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/* Expected number of non-NULL elements in the output array */
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#define EXPECT (INPUT_MAX * 2 - 2)
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static int __init test_memcat_p_init(void)
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{
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struct test_struct **in0, **in1, **out, **p;
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int err = -ENOMEM, i, r, total = 0;
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in0 = kcalloc(INPUT_MAX, sizeof(*in0), GFP_KERNEL);
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if (!in0)
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return err;
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in1 = kcalloc(INPUT_MAX, sizeof(*in1), GFP_KERNEL);
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if (!in1)
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goto err_free_in0;
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for (i = 0, r = 1; i < INPUT_MAX - 1; i++) {
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in0[i] = kmalloc(sizeof(**in0), GFP_KERNEL);
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if (!in0[i])
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goto err_free_elements;
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in1[i] = kmalloc(sizeof(**in1), GFP_KERNEL);
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if (!in1[i]) {
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kfree(in0[i]);
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goto err_free_elements;
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}
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/* lifted from test_sort.c */
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r = (r * 725861) % 6599;
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in0[i]->num = r;
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in1[i]->num = -r;
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in0[i]->magic = MAGIC;
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in1[i]->magic = MAGIC;
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}
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in0[i] = in1[i] = NULL;
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out = memcat_p(in0, in1);
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if (!out)
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goto err_free_all_elements;
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err = -EINVAL;
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for (i = 0, p = out; *p && (i < INPUT_MAX * 2 - 1); p++, i++) {
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total += (*p)->num;
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if ((*p)->magic != MAGIC) {
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pr_err("test failed: wrong magic at %d: %u\n", i,
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(*p)->magic);
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goto err_free_out;
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}
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}
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if (total) {
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pr_err("test failed: expected zero total, got %d\n", total);
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goto err_free_out;
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}
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if (i != EXPECT) {
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pr_err("test failed: expected output size %d, got %d\n",
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EXPECT, i);
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goto err_free_out;
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}
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for (i = 0; i < INPUT_MAX - 1; i++)
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if (out[i] != in0[i] || out[i + INPUT_MAX - 1] != in1[i]) {
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pr_err("test failed: wrong element order at %d\n", i);
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goto err_free_out;
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}
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err = 0;
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pr_info("test passed\n");
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err_free_out:
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kfree(out);
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err_free_all_elements:
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i = INPUT_MAX;
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err_free_elements:
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for (i--; i >= 0; i--) {
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kfree(in1[i]);
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kfree(in0[i]);
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}
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kfree(in1);
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err_free_in0:
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kfree(in0);
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return err;
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}
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static void __exit test_memcat_p_exit(void)
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{
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}
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module_init(test_memcat_p_init);
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module_exit(test_memcat_p_exit);
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MODULE_LICENSE("GPL");
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