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author | Florian Weimer <fweimer@redhat.com> | 2019-10-07 19:03:50 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2019-10-07 19:03:51 +0200 |
commit | 921abe47299255a6480456c98fbb53bdc5db92a2 (patch) | |
tree | e8201c2596a51eacfadcad4f030373fba6df2fad /ChangeLog | |
parent | 0caab6638e22a301e8aa0b35f790b15aaf0791d9 (diff) | |
download | glibc-921abe47299255a6480456c98fbb53bdc5db92a2.tar.gz glibc-921abe47299255a6480456c98fbb53bdc5db92a2.tar.xz glibc-921abe47299255a6480456c98fbb53bdc5db92a2.zip |
riscv: Remove support for variable page sizes
_dl_var_init is used to patch the read-only data section after relocation. Several architectures use this to update GLRO(page_size) with the correct value for the static dlopen case, where _rtld_global_ro has not been initialized by the dynamic loader. RISC-V does not need this. The RISC-V Instruction Set Manual, Volume II: Privileged Architecture, Document Version 20190608-Priv-MSU-Ratified says this: After much deliberation, we have settled on a conventional page size of 4 KiB for both RV32 and RV64. We expect this decision to ease the porting of low-level runtime software and device drivers. The TLB reach problem is ameliorated by transparent superpage support in modern operating systems [2]. Additionally, multi-level TLB hierarchies are quite inexpensive relative to the multi-level cache hierarchies whose address space they map. [2] Juan Navarro, Sitaram Iyer, Peter Druschel, and Alan Cox. Practical, transparent operating system support for superpages. SIGOPS Oper. Syst. Rev., 36(SI):89–104, December 2002. This means that the initialization of _rtld_global_ro._dl_page_size in elf/rtld.c with EXEC_PAGESIZE is sufficient for RISC-V.
Diffstat (limited to 'ChangeLog')
-rw-r--r-- | ChangeLog | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 47f60ef725..b040b66e26 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,13 @@ 2019-10-07 Florian Weimer <fweimer@redhat.com> + riscv: Remove support for variable page sizes. + * sysdeps/unix/sysv/linux/riscv/Makefile [$(subdir) == elf] + (sysdep_routines): Do not add dl-static. + * sysdeps/unix/sysv/linux/riscv/dl-static.c: Remove file. + * sysdeps/unix/sysv/linux/riscv/ldsodefs.h: Likewise. + +2019-10-07 Florian Weimer <fweimer@redhat.com> + nptl: Move pthread_attr_getschedparam implementation into libc. * nptl/Makefile (routines): Add pthread_attr_getschedparam. (libpthread-routines): Remove pthread_attr_getschedparam. |