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m32r: add __ucmpdi2 to fix build failure 

We are having build failure with m32r and the error message being:

  ERROR: "__ucmpdi2" [lib/842/842_decompress.ko] undefined!
  ERROR: "__ucmpdi2" [fs/btrfs/btrfs.ko] undefined!
  ERROR: "__ucmpdi2" [drivers/scsi/sd_mod.ko] undefined!
  ERROR: "__ucmpdi2" [drivers/media/i2c/adv7842.ko] undefined!
  ERROR: "__ucmpdi2" [drivers/md/bcache/bcache.ko] undefined!
  ERROR: "__ucmpdi2" [drivers/iio/imu/inv_mpu6050/inv-mpu6050.ko] undefined!

__ucmpdi2 is introduced to m32r architecture taking example from other
architectures like h8300, microblaze, mips.

Link: http://lkml.kernel.org/r/1465509213-4280-1-git-send-email-sudipm.mukherjee@gmail.com
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sudip Mukherjee 2016-07-26 15:21:23 -07:00 committed by Linus Torvalds
parent 8cde0daf6c
commit a44ce52363
4 changed files with 45 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/m32r/kernel/m32r_ksyms.c
View File

@ -41,6 +41,9 @@ EXPORT_SYMBOL(cpu_data);
EXPORT_SYMBOL(smp_flush_tlb_page);
#endif
extern int __ucmpdi2(unsigned long long a, unsigned long long b);
EXPORT_SYMBOL(__ucmpdi2);
/* compiler generated symbol */
extern void __ashldi3(void);
extern void __ashrdi3(void);

4
arch/m32r/lib/Makefile
View File

@ -3,5 +3,5 @@
#
lib-y := checksum.o ashxdi3.o memset.o memcpy.o \
delay.o strlen.o usercopy.o csum_partial_copy.o
delay.o strlen.o usercopy.o csum_partial_copy.o \
ucmpdi2.o

23
arch/m32r/lib/libgcc.h Normal file
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@ -0,0 +1,23 @@
#ifndef __ASM_LIBGCC_H
#define __ASM_LIBGCC_H
#include <asm/byteorder.h>
#ifdef __BIG_ENDIAN
struct DWstruct {
int high, low;
};
#elif defined(__LITTLE_ENDIAN)
struct DWstruct {
int low, high;
};
#else
#error I feel sick.
#endif
typedef union {
struct DWstruct s;
long long ll;
} DWunion;
#endif /* __ASM_LIBGCC_H */

17
arch/m32r/lib/ucmpdi2.c Normal file
View File

@ -0,0 +1,17 @@
#include "libgcc.h"
int __ucmpdi2(unsigned long long a, unsigned long long b)
{
const DWunion au = {.ll = a};
const DWunion bu = {.ll = b};
if ((unsigned int)au.s.high < (unsigned int)bu.s.high)
return 0;
else if ((unsigned int)au.s.high > (unsigned int)bu.s.high)
return 2;
if ((unsigned int)au.s.low < (unsigned int)bu.s.low)
return 0;
else if ((unsigned int)au.s.low > (unsigned int)bu.s.low)
return 2;
return 1;
}