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Tom Lane 36d2c3ad33 Fix spinlock assembly code for MIPS so it works on MIPS r6. 
Original MIPS-I processors didn't have the LL/SC instructions (nor any
other userland synchronization primitive).  If the build toolchain
targets that ISA variant by default, as an astonishingly large fraction
of MIPS platforms still do, the assembler won't take LL/SC without
coercion in the form of a ".set mips2" instruction.  But we issued that
unconditionally, making it an ISA downgrade for chips later than MIPS2.
That breaks things for the latest MIPS r6 ISA, which encodes these
instructions differently.  Adjust the code so we don't change ISA level
if it's >= 2.

Note that this patch doesn't change what happens on an actual MIPS-I
processor: either the kernel will emulate these instructions
transparently, or you'll get a SIGILL failure.  That tradeoff seemed
fine in 2002 when this code was added (cf 3cbe6b247), and it's even
more so today when MIPS-I is basically extinct.  But let's add a
comment about that.

YunQiang Su (with cosmetic adjustments by me).  Back-patch to all
supported branches.

Discussion: https://postgr.es/m/15844-8f62fe7e163939b3@postgresql.org
2019-06-22 20:31:50 -04:00
..
access Fix WAL format incompatibility introduced by backpatching of 52ac6cd2d0 2019-03-24 15:44:56 +03:00
bootstrap pgindent run for 9.5 2015-05-23 21:35:49 -04:00
catalog Fix missing role dependencies for some schema and type ACLs. 2018-11-09 20:42:03 -05:00
commands Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -05:00
common Fix integer-overflow problems in interval comparison. 2017-04-05 23:51:28 -04:00
datatype Define integer limits independently from the system definitions. 2015-04-02 17:43:35 +02:00
executor Fix failure with initplans used conditionally during EvalPlanQual rechecks. 2018-09-15 13:42:34 -04:00
fe_utils Empty search_path in Autovacuum and non-psql/pgbench clients. 2018-02-26 07:39:48 -08:00
foreign Allow foreign and custom joins to handle EvalPlanQual rechecks. 2015-12-08 12:54:33 -05:00
lib Revert "Permit dump/reload of not-too-large >1GB tuples" 2016-12-06 12:45:49 -03:00
libpq Fix detection of passwords hashed with MD5 2019-04-24 09:05:30 +09:00
mb Teach UtfToLocal/LocalToUtf to support algorithmic encoding conversions. 2015-05-14 22:27:12 -04:00
nodes Change more places to be less trusting of RestrictInfo.is_pushed_down. 2018-04-20 15:19:17 -04:00
optimizer Fix incorrect handling of join clauses pushed into parameterized paths. 2018-04-19 15:49:12 -04:00
parser Fix INSERT ON CONFLICT UPDATE through a view that isn't just SELECT *. 2018-08-04 19:38:59 -04:00
port Remove overzeleous assertions in pg_atomic_flag code. 2018-04-07 18:30:15 -07:00
portability Use mmap MAP_NOSYNC option to limit shared memory writes 2015-03-21 22:06:19 -04:00
postmaster Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -05:00
regex Suppress compiler warnings about useless comparison of unsigned to zero. 2016-02-15 17:11:52 -05:00
replication Mark ReplicationSlotCtl as PGDLLIMPORT. 2019-06-13 10:53:17 -04:00
rewrite Fix creation of resjunk tlist entries for inherited mixed UPDATE/DELETE. 2017-11-27 17:54:11 -05:00
snowball Update copyright for 2015 2015-01-06 11:43:47 -05:00
storage Fix spinlock assembly code for MIPS so it works on MIPS r6. 2019-06-22 20:31:50 -04:00
tcop Fix event triggers for partitioned tables 2018-10-06 19:17:46 -03:00
tsearch Fix statically allocated struct with FLEXIBLE_ARRAY_MEMBER member. 2015-02-20 17:50:18 -05:00
utils Fix missing role dependencies for some schema and type ACLs. 2018-11-09 20:42:03 -05:00
.gitignore Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
c.h Allow btree comparison functions to return INT_MIN. 2018-10-05 16:01:30 -04:00
fmgr.h Revert addition of PGDLLEXPORT in PG_FUNCTION_INFO_V1 macro. 2016-10-12 18:02:03 -04:00
funcapi.h Add a utility function to extract variadic function arguments 2017-10-25 07:20:37 -04:00
getaddrinfo.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
getopt_long.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
Makefile Empty search_path in Autovacuum and non-psql/pgbench clients. 2018-02-26 07:39:48 -08:00
miscadmin.h Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -05:00
pg_config.h.in Avoid thread-safety problem in ecpglib. 2019-01-21 23:18:58 -05:00
pg_config.h.win32 Stamp 9.5.18. 2019-06-17 17:23:53 -04:00
pg_config_ext.h.in Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_ext.h.win32 Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_manual.h Further reduce the number of semaphores used under --disable-spinlocks. 2016-04-18 13:33:07 -04:00
pg_getopt.h Use our own getopt() on OpenBSD. 2019-01-18 15:06:26 -05:00
pg_trace.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
pgstat.h Rearrange pgstat_bestart() to avoid failures within its critical section. 2019-05-11 21:27:13 -04:00
pgtar.h Adopt the GNU convention for handling tar-archive members exceeding 8GB. 2015-11-21 20:21:32 -05:00
pgtime.h Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -05:00
port.h Fix misc typos in comments. 2019-01-23 13:46:51 +02:00
postgres.h Adjust DatumGetBool macro, this time for sure. 2016-04-28 11:51:08 -04:00
postgres_ext.h pgindent run for 9.4 2014-05-06 12:12:18 -04:00
postgres_fe.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
rusagestub.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
windowapi.h Update copyright for 2015 2015-01-06 11:43:47 -05:00